3^(Х+3)+3^(Х+2)-3^Х < 2^(Х/2)+2^(Х/2-1)+2^(Х/2-2)
3^(x)*(27+9-1) < 2^(x/2)*(1+(1/2)+(1/4)) 3^(x)*35 < 2^(x/2)*(7/4) 3^(x)*20 < 2^(x/2) (3/sqrt(2))^x < 1/20 x < log_(3/sqrt(2))(1/20)